Portable stop for electric cranes.



l 1. A.1QNE S. PORTABLE STOP FOR ELECTRIC CRANES.

APPLICATION FILED JAN-3h 1916.

1,177,707. L Patente@ Apr. 4,1916i JAMES A. sonas, or CHICAGO, IL LrNors'.

PORTABLE STGP-FOR ELECTRIC CRANES.

Specification of Letters Patent.

Patented Apr. a, 1916.

Application filed January 31, 1916. Serial No. 75,409.

To all lwhom t may concern.'

Be it known that I, Jarras A. Jones, a citizen of the United States, and resident of Chicago, in the county of Cook and State of Illinois, have invented certain new and use- `ful Improvements in Portable Stops for Electric Cranes, of which the following is a speciication. My invention relates to a portable stop adapted -for application to the rails upon which electric cranes are supported and for similar uses .where such stops are required. In the operation of cranes of the traveling type it is sometimes necessary as a safety precaution to locate a positive stop on the runway in order to surely-prevent the crane from entering a danger zone. Furthermore,

it is not uncommon to provide two or more traveling cranes operating on the same track. AlVhen repairs are necessaryA to one of these cranes it is desirable to locate'a stop on the track at the side from which another crane is operating to pbviate the danger of collision` and thepo's/sible' injury of the men engaged in repairing the still crane.

An object in the construction of the present device is toprovide one which shall be of exceedingly simple construction, of light weight and which may be readily applied' and removed without the loss of time or the use of instruments or tools.

The invention will be more readily understood by reference to the accompanying drawings, ,wherein- Figure 1 is a vertical section through a stop as applied to the track, the section being taken on the line 1-1 of Fig. 2; Fig. 2 is a-section on the line 2-2 of Fig. 1, and Fig. 3 is a side elevation of the construction.

Referring more particularly to the drawi ings, it willl be seen that I have indicated the track at 10, which is of the usual .T shape. The stop comprises an arched pgrtion 11. The upper corners are curved to the radius of the wheels which operate on the track 10. The arched portion 11 is integral with the base 13, which rests directly upon the rail head, the base being provided .y

with va depending flange 14, which is inturned to form a marginal flange 15, said flange 15 being adapted to underliea portion of the rail head. Rigidly mounted within the channel formed by the, inturned flange 15 and the base 18 at one side of the base is a hard steel bar 16, oneface or edge 17 of which is serrated or toothed whereby to firmly engage the head of thev rail. In

the channel at the opposite side of the basel is mounted a similar bar 18, the latter bar being mounted for reciprocation in a horizontal plane by reason of thef pins 19 and coil springs 20, the springs tending to hold the bar in a retracted position with rela tionto the rail head. Two pairs of apertured 'ears 21, 22, project horizontally from the base and the flanged portion 15.v of-the device, the apertures in each pair of lugs or ears being in register' and accommodating pins 23, 24, the pins serving to retain in place the levers 25, 26. The inner' ends ofth'eV levers are in the form or" cams, e., the apertures for the pins 23, 24 are located eccentrically of the semi-circular end portions 27, 28 of the levers. The arrangement is such that by moving the levers in a clockwise direction, as viewed in Fig. 2, a powerful gripping action is secured on the bar 18, causing the same to 'firmly engage the head of the rail.

It will be ,seen that the device may be quickly applied and removed from' a rail Without the use of tools, that'the same is light and may be readily handledby one vworkman and is extremely simple and ecocoperate with a rail head, a lpair of hard steel toothed bars mounted in said base portion and oppositely disposed to engage two sides of a rail head, and a cam lever mount ed to engage one oi' said cam bars to force the same. into engagement with the rail head, substantially as described.

In a'device of the class described, the

combination Aof a Wheel-engaging stop, an integralfbase portion having downwardly and inwardly inclined marginal edges thereby providing channels at each side of a' rail head, a had steel toothed bai' mounted in eaci of said channels and a pair of cam levers mounted in said base vand adapted to V act upon one of said hard steel'bars whereby toi force the saine into engngementwitli a rail head, substantiallas described.

of January, A. D. 1916.

JAMES A.: JONES. Witnesses:

. D. v. MEDAL@ H. T. ROBERTS.

Copies M ths patent may be obtained for ve cents each, by addressing the Commilsi'oner ot Patents,

. Washington,1).0.

1o Signed at Chicago, Illinois, this 22nd day t 

